Reinforced polymer molding composition

Abstract

The present invention relates to a reinforced polyamide molding composition, comprising a thermoplastic polyamide and a fibrous reinforcing agent, wherein the fibrous reinforcing agent comprises a mixture of glass fibers made of E-glass and glass fibers made of High Strength-glass. The present invention also relates to a molded part, made of the reinforced polyamide molding composition, as well as to an electrical or electronic device, comprising the molded part.

1 . Reinforced polymer molding composition, comprising a thermoplastic polymer and a fibrous reinforcing agent, wherein the thermoplastic polymer comprises a thermoplastic polymer selected from LCP, polyester, PPS, polycarbonate and polyamide, the fibrous reinforcing agent comprises a mixture of glass fibers made of E-glass and glass fibers made of High Strength-glass, and the E-glass and the High Strength-glass are present in a weight ratio E:HS in a range from 80:20 up to and including 20:80. 
     
     
         2 . Composition according to  claim 1 , wherein
 the E-glass consists of:
 52-62 wt. % silicon dioxide (SiO 2 ), 
 12-16 wt. % aluminum oxide (Al2O3), 
 16-25 wt. % calcium oxide (CaO), 
 0-10 wt. % boron oxide (B2O3), 
 0-5 wt. % magnesium oxide (MgO), and 
 0-5 wt. % other components, 
 wherein the weight percentages (wt. %) are relative to the total weight of the E-glass; 
   and the High Strength-glass consists of
 57-70 wt. % silicon dioxide (SiO2), 
 18-30 wt. % aluminum oxide (Al2O3), 
 0-10 wt. % calcium oxide (CaO), 
 0-5 wt. % boron oxide (B2O3), 
 7-15 wt. % magnesium oxide (MgO), and 
 0-5 wt. % other components, 
 wherein the weight percentages (wt. %) are relative to the total weight of the High Strength-glass. 
   
     
     
         3 . Composition according to  claim 2 , wherein the High Strength glass consists of:
 58-68 wt. % silicon dioxide,   20-28 wt. % aluminum oxide,   0-5 wt. % calcium oxide,   0-5 wt. % boron oxide,   8-13 wt. % magnesium oxide, and   0-5 wt. % other components,   wherein the weight percentages (wt. %) are relative to the total weight of the High Strength-glass.   
     
     
         4 . Composition according to  claim 2 , wherein the High Strength glass consists of:
 62-66 wt. % silicon dioxide,   22-27 wt. % aluminum oxide,   0-5 wt. % calcium oxide,   0-3 wt. % boron oxide,   8-12 wt. % magnesium oxide, and   0-3 wt. % other components,   wherein the weight percentages (wt. %) are relative to the total weight of the High Strength-glass.   
     
     
         5 . Composition according to  claim 5 , wherein the E-glass fibers and the High Strength-glass fibers are present in the weight ratio E:HS in a range from 75:25 up to and including 50:50. 
     
     
         6 . Composition according to  claim 1 , wherein thermoplastic polymer comprises a semi-crystalline polyamide. 
     
     
         7 . Composition according to  claim 1 , wherein thermoplastic polymer comprises a mixture of at least two thermoplastic polyamides. 
     
     
         8 . Composition according to  claim 8 , wherein the mixture of at least two thermoplastic polyamides comprises a semi-crystalline polyamide and an amorphous thermoplastic polyamide. 
     
     
         9 . Composition according to  claim 1 , wherein the E-glass fibers, or the High Strength-glass fibers, or E-glass fibers and the High Strength-glass fibers have a non-circular cross section with an axial ratio of the cross-sectional axes in the range of 1.5-6, preferably in the range of 2-4. 
     
     
         10 . Composition according to  claim 1 , wherein the composition consists of
 a. 20-70 wt. % of the thermoplastic polyamide;   b. 25-70 wt. % of the mixture of E-glass and High Strength-glass; and   c. 0-30 wt. % of at least one other component;   and wherein the weight percentages (wt. %) are relative to the total weight of the total amount of a, b and c equals 100 wt. %.   
     
     
         11 . Molded part, made of a reinforced polymer molding composition as defined in  claim 1 . 
     
     
         12 . Molded part according to  claim 1 , wherein the molded part is a structural part for an electronic device, or a structural part an automotive engine, or a support element for an automotive engine. 
     
     
         13 . Molded part according to  claim 12 , wherein the molded part is a stiffener, a frame or a housing, or a part thereof, for a portable electronic device, or is a connector part. 
     
     
         14 . Electrical or electronic device, comprising a molded part according to  claim 12 .